弱耦合一维扩展赫伯特模型的基态相图(英文)

Weak-coupling Ground State Phase Diagram of the One-dimensional Extended Hubbard Model

我们利用玻色化和重整化群分析的方法研究了半满填空且排斥势小于跃迁动能时的一维扩展赫伯特模型的基态相图,发现基态相图是由自旋密度波,电荷密度波和键荷密度波组成.这些结果揭示了扩展赫伯特模型和赫伯特模型基态相图的差异.

By using the bosonization approach and renormalization group analysis, we study the ground state phase diagram of one-dimensional extended Hubbard model at half-filling in the regime where U and V are both positive but less than t, finding that the system shows three distinct ground states characterized by the spin-density-wave, the charge-density-wave and the bond-charge-density-wave, respectively. These results demonstrate that the ground state phases of the extended Hubbard model are not identical with those of the conventional Hubbard model.